Rumble was bored, which meant that finding some form of entertainment was in order. He remembered how upset his mother used to get at his ways of alleviating boredom. Apparently, sticking the neighbor's cat in the oven wasn't appropriate or normal behavior. The authorities later made it clear that neither was electrocuting your unapproving mother in the shower. If only someone had given him a list of things that weren't acceptable because he apparently wasn't able to figure it out on his own…or maybe he just didn't care; he was never quite sure.
As it was, no list had yet been provided for him and he sat in an alley adjacent from the hideout with a stray dog he'd been dissecting. He currently had various organs spread out on the dirty pavement. He knew what some of them were, the heart and intestines were obvious, but he wasn't an authority on anatomy. As he was trying to identify the other body parts before him, and vaguely wondering what the spleen and pancreas did, the Joker opened a door to the strange scene but didn't seem to give it much notice.
"Hey, boss," Rumble asked as he walked by. "Which one is the liver?"
"The big one," he revealed as he directed a couple of henchman to dispose of some body bags that were notably full.
"Cool. Thanks," he said as his boss disappeared again.
With that out of the way, Rumble was bored again and that's when Harley, White, and Henshaw entered the alley back from whatever it was they went off and did. Rumble thought finding out where they kept taking off to would give him something to do tomorrow.
The following day, Rumble followed Harley and her protectors, staying far enough back that he was not noticed. He watched them enter a bar he did not frequent and then sat on the curb across the street from the establishment, disappointed at the anticlimactic location. Rumble wasn't sure what he was expecting to find, but this wasn't anything special. Although, now that he thought about it, a bar was a rather social location. One of the costumes mingling with the help seemed rather odd. Perhaps she just wanted a drink? If that was the case, she wouldn't be in there too long and he decided to wait and see how much time passed.
So Rumble waited a while, occasionally finding a nice cockroach to squish. Inside, Harley, White, and Henshaw did not head directly to the roof as Harley wanted to take on the dart board again just to prove how far she'd come. This lead to them playing a few rounds and it wasn't as boring as she had previously thought it'd be, probably because she was able to see how much she'd improved.
Afterward, they began their familiar pattern of rolling one of the tables up the stairs. Those that frequented the bar were used to it by now and even the bartender didn't pay it much mind anymore.
Rumble was beginning to get impatient, and about to enter the establishment to see what was going on, when he heard gunshots firing from above. The building wasn't tall, only two stories, and across the street Rumble could clearly see Harley shooting…at something. He wasn't quite sure what.
Well, that's sorta strange, Rumble thought as he watched Harley reload and fire again into space. At least, I think it's strange. The boss would know, he concluded and set off back to the hideout. Once arriving, he headed straight to the boss's 'office' and entered without courtesy of providing notice.
Joker irritably looked up from his work and slowly asked the man if he'd ever heard of knocking. Knocking had not occurred to Rumble, and he decided it must be one of those norms he didn't quite get. He immediately exited the room, closed the door, and knocked.
"You've got to kidding me," the Joker muttered quietly but couldn't help chuckling. "What do you want?" he snapped to the man behind the door.
Rumble figured he was allowed to enter at this point, so he reopened the door. Joker was looking at him impatiently. "Boss, I was just wonderin' what Harley was doing hangin' out at a bar with two of your boys. It just seemed kinda weird…" he explained but was quickly silenced.
"That's what you interrupted me for? Do you honestly think this is worth my time?" he vented as he returned to his work, but, at that moment, the meaning of Rumble's words sank in. "…Wait…What did you say?"